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Russian President Vladimir Putin has warned America and its allies against taking one-sided action in Syria.
He said any military strikes without UN approval would be "an aggression".
US President Barack Obama has called for punitive action in response to an alleged chemical weapons attack.
Mr Putin said Russia did not rule out supporting a UN Security Council resolution authorising force, if it was proved "beyond doubt" that the Syrian government used chemical weapons.
On Tuesday evening, members of the Senate Foreign Relations Committee agreed on a draft resolution backing the use of US military force.
The measure, to be voted on next week, sets a time limit of 60 days on any operation.
According to the draft resolution, the operation would be restricted to a "limited and tailored use of the United States Armed Forces against Syria", and ban the use of any ground forces.
The US has put the death toll from the alleged chemical attack on the outskirts of Damascus on 21 August at 1,429, though other countries and organisations have given lower figures.Convincing evidence
Mr Putin was speaking ahead of the G20 summit in St Petersburg, which opens on Thursday and is supposed to concentrate on the global economy, but now looks likely to be dominated by the Syrian crisis.
In a wide-ranging interview with The Associated Press and Russia's state Channel 1 television, Mr Putin said it was "ludicrous'' that Syrian President Bashar al-Assad, an ally of Russia, would use chemical weapons at a time when it was gaining ground against the rebels.